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Circularly polarized patch antenna with two different C‐shaped ring structures
Author(s) -
Sung Youngje
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31972
Subject(s) - diagonal , asymmetry , turnstile antenna , coplanar waveguide , axial ratio , optics , antenna (radio) , patch antenna , physics , ring (chemistry) , microstrip antenna , circular polarization , geometry , slot antenna , telecommunications , microstrip , engineering , mathematics , chemistry , microwave , organic chemistry , quantum mechanics
In this letter, we propose a novel design for circularly polarized (CP) antennas using two simple C‐shaped ring structures. The widths ( W L and W R ) of the two C‐shaped ring structures are different and these rings are also misaligned to achieve asymmetry. This asymmetry is different from conventional methods, such as perturbations on a diagonal line. It exists on the top layer of the substrate and acts as a radiating element. In order to implement the proposed structure as a single‐layer, a feed structure is implemented by a coplanar waveguide (CPW) method on the bottom layer of substrate. From measured results, the proposed antenna shows very good axial ratio (AR) of 0.8 dB and gain of 3.5 dBi at 2.289 GHz. From this analysis, it is demonstrated that some parameters independently change the frequency with the minimum value of AR and resonant frequency. This design is very useful for designing CP antennas.